Or rather, if it does exist (Which I don't believe it does), it's vanishingly small. The idea that women make $.77 to a man's $1 is ludicrous and here's why.
Department of Labor study finding pay gap is caused by choices rather than discrimination.
Men work, on average, 27% more hours than women while suffering 13.3 times as many on-the-job fatalities
Pay statistics don't compare apples with apples
Fair pay doesn't always mean equal pay
In New York, women between the ages of 21 and 30 earned, on average, 17%, on average, more than men
Pay gap activists purposely distort yearly earnings down to hourly earnings to make it appear as though women earn less.
The recession has actually hit men harder than women. Men, as a group, in the workforce have lost almost twice as many jobs as women. This means women now outnumber men in the workforce.
Society provides women an option to be the primary parent, which most seem to take. 57% of Harvard and Stanford female graduates left the workforce within 15 years of graduation rather than put up with long, stressful hours.
Blaming men for women's choices is unfair when most men support their wives' decisions to leave or enter the workforce.
In the book, Why Men Earn More, Warren Farrell found that while men do generally earn more, women were offered better balance and more options in their lives such as flexibility, shorter commutes, lower physical risk and the option to become a primary parent (Whereas men are expected to take the highest paying job regardless of stress, flexibility, commute or physical risk and VERY few people support a male primary parent). In short, they made less by choice and were happier for it.
Women stay out of more lucrative employment fields by choice, not because of sexism.
Here's a nice article about why women only make up 5% of entrepreneurs in the US.
So can we please stop hearing about the gender pay gap in political and gender-relations discussions?